SplineBone

"Allows you to create a linked bone chain that exactly follows a selected editable spline - regardless of length or segments. The bones are created from vertex to vertex. You can then use the original spline in a spline IK solution if you choose.
The bones do not update to the position of the spline - and the script ignores modifiers. But could be useful for creating a complex bone chain when creating the shape you want with a spline is so much easier.
The end nub bone is supposed to look funny - basically its beginning and end points are in the same space. This doesn't upset anything though."